Fountain-pen.



J. GILBERT.

FOUNTAIN PEN.

APPLICATION FILED AUG. I3. 1913.

Patented Nov. 23, 1915.

*wi* 11 con ao JUSTIN GILBERT, 0F VICTORIA, BRITISH COLUMBIA, CANADA.

' LILIQS.

Specification of Letters Patent.

Patented Nov. 23, i915.

Application filed August 13, 1913. ASerial No. 784,555.

To all whom t may concern:-

Be it known that I, JUSTIN GILBERT, a

subject of the King of Great Britain, re

tions, and the heat of the hand in'holding the pen; another objection to the usual type of fountain pen is that they are opaque and consequently lthe user cannot determine when the pen needs refilling until he is apprised of that fact by the failure of the pen to write.

rllhe object of'my invention is to overcome these objections' and it consists first, in a vacuum chamber applied to that p'ortion of the wall of the main barrel which adapts it to separate theoverlying portion of the user"s hand from the ink reservoir, and prevent the conduction of heat to the contents of the latter, the linger grip or portion of the pen beyond the main barrel being left free fromthe surrounding insulatorysecond, in means to close the ink feed duct to prevent theV passage of ink therethrough, third to form the pen of transparent material; fourth in the parts and combination of parts as will be hereinafter more fully set forth.

In the drawings -Figure 1 is av longitudinal vertical section of afountain pen embodying my invention; Fig.r 2 is lan enlarged detail section showing the ink duct open; Fig. 3 is an enlarged detail sectional view showing the inkv duct closed; Fig. l is an enlarged detail sectional view of a packing; Fig. 5 is a detail sectional view through the nib end of a pen showing another embodiment of my inventionwith the feed duct open; Fig. 6 is a similar view showing the feed, duct closed and the top of the pen in place;A Fig. 7 is a top plan view of the feed bar; .Fig 8 is a bottom plan view of the feed bar; Fig. 9 is a detail sectional view of the nib end of a fountain pen showing another embodiment of my invention with the feed duct open; Fig. 10 is a similar view showing the feed duct closed; Fig. 11 is a detail sectional view of a fountain pen showing another embodiment of my invention; Fig. 12 is an enlarged detail secv tional View `of the closure used in Fig. 11.

Referring to Figs. l, 2, 3, and 4, the-reference numeral 1v designates the main barrel or reservoir of a fountain pen and la the finger grip' or shaped portion beyond the same, the former portion 1 being made of l two sleeves, preferably of thin transparent material with a space 2 therebetween, the sleeves being sealed up air tight at each end, the final sealing lbeing done after. the air has been exhaustedl from the space between the sleeves, so as to maintain a vacuum. The rear end of the barrel is preferablyleft solid for the combined purpose of spacing the two sleeves and hermetically closing the vacuum chamber atthatend. The forward finger grip or shaped portion 1i is preferably solid, except for the ink duct and other passage therethrough, and serves effectively for joining the front ends of the concentric vacuum chamber walls and' hermetically closing the vacuum at that point; 'liras much as the vacuum is a non-conductor, a change of temperature will not pass through it, therefore the air inside of this pen will not be subjected to atmospheric changes, nor to the heat from the hand which usually causes an excessive flow of ink, therefore the contents of the pen remain at an even n temperature irrespective of the use of the pen. The warming and consequent expansion of the contents of a fountain pen causes the feed to flow too rapidly when a' person starts to write with acold pen; this overflow being the most marked and excessive when thejpen is nearly full of air and the ink nearly exhausted. One of the many advantages of the transparency of the pen is that the person is enabled to determine accurately when the pen needs filling and when it has been properly filled. Also one may readily locate an obstruction inthe feed duct of the pen. 3 is a feed bar of approved construction having a feed ductt, said feed bar being adapted to fit within the nib end of the pen in the usual manner. 5 is an opening formed transversely through the feed bar intercepting the feed duct 4. The'main barrel or body l is provided with a transverse opening 6 in onel of its walls in line with the opening 5 in the feed bar but of greater diameter. than the opening 5 and provided with interior screw threads, .the perimeter of the feed bar forming a seat at the bottom of the opening 6 on which the lll) base 7 of a, gasket 8 is adapted to be secured by means of the annular clamping nut 8,

said nut being adapted to engage the screw threads I of the opening 6 inv the barrel, whereby it .clamps the base flange of the gasket 8 firmly on the perimeter of the feedA bar, the perimeter of the base liange 7 clos- Huid tight in the opening 5 in theffeed bar the body of the pen, said plunger is forced- 3. 1+i is a coil spring, one end of which is seated on the clamping nut 8 and the other end under the cap head of the plunger 9 whereby, when the cap 15 is removed from outwardly' carrying with it the dam 13, thus opening the feed duct of the feed bar and permitting a free flow of ink therethrough. l/Vhen theeap 15 is replaced on. the body of the pen it engages the capfiojf the plunger 9, thereby forcing the plunger downward and projecting the dam 13 into the feed yduct thus preventing the How of ink therethrough as shown more clearly in- Referring to Figs. 5, 6, 7 and 8. 16 is the main body of the pen, 17 is a feed. b ar having the feed duct 18,-said feed bar being provided with a longitudinally disposed slot 19 'intercepting thefeed duct and having upwardly converging walls, whereby the areaA of the slot is less bottom.

liecting through an opening 22 in the wall of the pen body 1G with its inner end firmly secured to the bar 20. When the cap is removed Afrom the body ofthe pen the parts assume the relation shown in Fig. 5, but when the cap 23 is placed upon the pen body it engagesthe' plunger 21 depressing it,

thereby forcing the dam through the top ,ofA

the gasket 8 which plunger 9 adapted to t at the top than. at the- 2G is a dam of flexible material seated in the slot 19. 21 is a .plunger prosolid, except for toria, British Columbia,

meines 26 vis adapted to reciprocate. In the constructionshouf'n in these figures the iiow of ink is closed ofi by pulling the rod 26 upwardly, therebycompressing the dam 25 between the converging walls of the nib end 'of the-pen. 'p

. Referring to Figs. lland l2 the construction of the feed bar is like that described in connection with Figs. 9 and 10 and the general opera-tion is Athe same as that described in connection with Figs. 9 and'10. The dam in Figs. 11 and 12 is composed of an annular spring 30 secured around the enlarged end 31 of the rod 32. 33 is a rubber band secured on the enlarged end 31 of the rod 32 and over the compressible spring 80. The ends of the rubber. band are firmly clamped on the enlarged end 31 by means of fine thread 34. Suitable fine textile material 3d is secured over the rubber band by said fine threads.. The diameter of the spring is such that when the dam is drawn into contact with the converging walls of the pen body at the nib end it is compressed, thereby form ing a fluid tight closure between it and the said converging walls and thus closing off ythe flow of ink through thc feed bar.

The various forms of fountain pens disclosed may all be filled by placing a bulb or squirt bottle over the writing end of the pen. By compressing the bulb, the ink will then be forced into the reservoir and the air 'out of it through the feed duct el.

lillhile l prefer to make the cap of the pen of transparent material it is not necessary to do so.

d fountain pen comprising a main barrel and. a nger grip; the main barrel being constructed of two spacedwalls with an ink reservoir within the inner-.wall and an insulating vacuum between the walls; said walls being hermetically united at their rea-r ends; the finger grip being substantially the ink or other functioning ducts formed therein, and being hermetically united. to and forming the spacing and chamber closing means for the forward ends of the walls of the main barrel; the parts being arranged substantially as shown and described to provide a vacuum insulating chamber restricted to the main barrel of the pen in rearof the linger grip.

The foregoing specification signed at Victhis 23rd day of July, 1913.-

JUSTIN u' ILBERT.

lin presence of two witnesses:

T. M. MILLER, 1 HELEN MACQURRIE. 

